Ukrainian President Volodymyr Zelenskyy celebrated security agreements and commitments reached at this year’s NATO Summit Wednesday, one day after publicly voicing his frustration with the alliance’s approach to engagement with Ukraine amid its ongoing war with Russia.

At a bilateral meeting with President Joe Biden in Vilnius, Lithuania, Zelenskyy, who attended the summit along with a delegation of Ukrainian officials, said the results of the summit were a win for Ukraine.

“I think by the end of summit, we have great unity from our leaders and the security guarantees — that is a success for this summit, I think so. It’s my opinion,” Zelenskyy said in response to a POLITICO reporter’s question Wednesday.

The comments come on the heels of frustrations Zelenskyy voiced on social media Tuesday with NATO over its refusal to allow Ukraine to immediately enter the alliance. NATO allies had reduced the steps needed for Ukraine to enter the alliance, waiving the requirement for a membership action plan, but acknowledged that concerns about corruption and the ongoing conflict in the country were barriers to Ukraine’s entry now. In response, Zelenskyy tweeted that the delay was “absurd.”